| 摘要 |
PURPOSE:To improve the ability of detection of a response signal, by continuous output during interval period in 2,100Hz for the phase signal and stoppiig of output for the 2,100Hz signal inputted in the time interval more than this period. CONSTITUTION:A group instruction signal GC and a phase signal are inputted to a detector 3 with demodulation. This signal is specified for 1.5-10sec and the phase signal is a 2,100Hz signal with an interval of 6.7-10 millisec. The 2,100Hz signal present in a leakage signal a' from a hybrid is irregular in level and width and has no continuity. Thus, an integration capacitor 3A of the de- tector 3 is adjusted to obtain continuous output to the signal GC and the phase signal and intermittent output to the signal a'. Thus, the output of the detctor 3 is applied to the reset terminal R of a counter 5 and D.FF6 to prevent mis-detection by the signal a' and the response signal consisting of the GC signal and phase signal returned from the old G2 machine at transmission side is caught and the function can surely be discriminated. |
